adding 'csize' (aka 'unsigned long') to a string does not append to the string

[Paul J. Lucas]

orba/src/store/naive/simple_store.cpp:95:52: warning: adding 'csize' (aka 'unsigned long') to a string does not append to the string [-Wstring-plus-int]
      ZORBA_FATAL(0, theNodeToReferencesMap.size() +

The use of '+' here is wrong: '+' doesn't create a string from an unsigned long and a char*.

Also:

zorba/src/store/naive/simple_store.cpp:108:52: warning: adding 'size_type' (aka 'unsigned long') to a string does not append to the string [-Wstring-plus-int]
      ZORBA_FATAL(0, theReferencesToNodeMap.size() +